def Unknown(X, Y):
     if X < Y:
        print(str(X + Y))
        return Unknown(X + 1, Y) * 2
     elif X == Y:
        return 1
     else:
        print(str(X + Y))
        return int(Unknown(X - 1, Y) / 2)
Unknown(10,15)


if __name__ == '__main__':
    a={1,2}
    set